You might need to do an Archive and Install installation, this will transfer your existing Mac OS X system files to a folder named Previous System, and then it will install a new copy of Mac OS X on the volume you have selected.
More good info is available at - http://support.apple.com/kb/TS1545
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Hi Bobby You will need to get an OS X installation DVD. Try eBay.Don't go for anything lower than 10.4 (Tiger)10.5 (Leopard) and 10.6 (Snow Leopard) should run fine on this machine.Don't bother with 10.7 or 10.8
Apple recommends that if you wish to go from 10.4 to 10.6 then you should purchase the 10.6 Box Set.
System Requirements to run Snow Leopard:
Mac computer with an Intel processor
1GB of memory
5GB of available disk space
DVD drive for installation
Snow Leopard Installation Instructions:
Just insert the DVD in the optical drive.
Restart your Mac while holding down the C key.
You will be guided through the installation procedure and be prompted at one point to choose which install option you want.
Once the Snow Leopard install is completed the Mac will restart itself.
You will probably be asked to register with Apple upon restart.
Enjoy Snow Leopard on your Mac!
Q: Can I upgrade directly from Mac OS X 10.4 (Tiger)?
A: Yes. Apple recommends purchasing the Mac Boxed Set for this
purpose, which will also update iLife (it is unknown at the time of this
writing whether older versions of iLife work with Snow Leopard) and
iWork. Also note that while it has been said that the $29 upgrade will
work with 10.4, it is not officially supported and may be in violation
of the licensing terms.
Q: What happened to the different install options? Can't I do an Archive & Install?
A: Apple has revamped the familiar installation options for Mac OS X.
You now have two choices, either a straight upgrade or a clean
install. Supposedly if you choose to do a straight upgrade, what
actually goes on behind the scenes is what was traditionally known as an
Archive & Install.
Q: Is there anything I can do to better prepare myself for the upgrade?
A: Yes. It is advisable to run a Verify/Repair Permissions and
Verify/Repair Disk in Disk Utility. You may also want to run the
maintenance tasks in Onyx. And finally, it would be wise to get your applications up to date using a program like AppFresh.
Start with OS X cd/dvd. put the cd in and restart, hold down C after you turn the laptop on. when the disk starts up, try to repair the hard drive (verify and repair permissions). I'd also try getting your hands on Disk Warrior, which can fix lots of hard drive problems. You might have to reinstall OS X though if it's bad. If you have to do this, you may want to upgrade the harddrive because that might be what caused the problem in the first place. If you go to repair permissions and it finds problems and repairs them. Try it again. If it finds problems the second time, you may have a bad hard drive. See how my answer is longer than your question. It really helps to provide details and specifics if you want a good answer. just keep that in mind if you reply. thanks. good luck.
Were you updating to Leopard from Tiger using an upgrade install? This was a common issue caused by APE (Application Performance Enhancer) a third party plugin for Mac OS X. The solution around it is to do an archive and install which will remove APE while retaining all of your data and programs. The only things reset are system configurations (Wifi passwords etc.).
Good luck
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